Running this keeps reloading the packed.js at each poll event. After 10 sec, my FF eats one entire CPU and becomes irresponsive. I also tried to disable the resource optimization with the same behavior (except that jsf.js is reloaded instead of packed.js)

If I replace the h:commandlink by a a4j:commandlink, the problem disapear.

The problem is the same with any render event, not only with the poll.